Improvement in mills for powdering roots



H. D. GARRISON. MILL FOR P-OWDERING- ROOTS, &c.

No. 109,196, Patented Nov. 15, 1870.

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HEROD D. GARRISON, OF CHICAGO, ILLINOIS, ASSIGNOR, TO GARRISON & MURRAY, OF SAME PLACE.

Letters Patent No. 109,196,1iated November 15, 1870.

IMPROVEMENT lN MILLS FOR POWDERING ROOTS, 8e0- The Schedule referred to in theselettezs Patent and making part of the same.

To all whom it may concern Be it known that I, HEROD D. Ganmsou, of Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in portion of the box or outer case, which iucloses the.

stones, removed;

Figure 2 is a horizontal section, taken as indicated by the line at a: in fig. 1; and y a Figure 3, a vertical section through the line 3 3 Similar letters of reference indicate corresponding parts.

This invention relates to fchasers or drug-mills for grinding roots, herbs, barks, gums, and other sub; stances; and It consists, first, in the arrangement of a curb or drum, extending vertically as high as practicable above and arouxid the bed-stoue to retain the material to be ground as closely as possible under the runners until it is. pulverized, and which also serves as a binder to prevent the bed-stone from cracking, or other damage. The invention likewise includes a novel mode of hanging the upper stones by means of sleeves or boxes hung on trunnions having a transverse relation to the axes'of said stones, which are thus left free to rise and fall to ride over hard substancesror obstacles in revolving bed-stone A, to serve' as a binder thereto,

the inill.

I Referring to the accompanying drawing' A represents the bed-stone, which may be supported bya-n iron disk, formed with a hub for securing, by means of setscrew and key, the stone to its vertical driving-shaft, B.

Said bed-stonc is hold in position by a metallic drum, 0, arranged to project above the face of the bed-stone to form a curb for retaining the drug or material under operation till reduced to powder, as required.

Motion may be communicated to the vertical central shaft B by means of bevel-gear a and b, oiby any other suitable means, arranged either above or below the bed-stone.

D D are the upper stones, arranged independently of each other for rotation around axes lying at right angles, or thcreabonts, to the vertical axis of the bedstone, but not moving around with the latter.

Two such upper runners are here shown; but there may be only one, or, if desired, more than two of them arranged around the axis of the bed-stone, andfree to be rotated by frictional contact with the upper or grinding surface of said stone, on which they rest.

N o restriction is, placed upon the kind of stone used.

Each runner D is hung so as to be capableof play up or down, to facilitate its riding over hard substances or lumps whiehare not capabletof being readily reduced to powder by the runners.

To effect this each of said runners has its shaft 0 arranged to rotate in a-sleeve or box, E, which is supported by trunnions (Z d, that are disposed in transverse relation to the axes of the runner.

These, and all the hearings, in fact, which require oiling, are arranged outside of the ease or box F, that incloses the several stones, and serves to prevent scat tering or waste of powder produced by grinding, and concentrates or collects it through any suitable outlet.

By this arrangement of said oil-bearings outside-of the powder-receptacle F, the product or powder is prevented from coming in contact with the oil on the bearings and of being tainted or injured by it.

What is here claimed, and desired to be secured by Letters Patent, is

1. The combination of the curb or drum 0 with the and extending vertically upward nearly to the axes of the runners D, so as to prevent the material being ground from overflowing; constructed substantially as herein shown and described.

2. The sleeve E, constructed with trunnions (1, arranged transversely to its axis, and near its outer end, for supporting the spindle c of the runner D, as and for the purpose set forth.

HEROD D. GARRISON.

Witnesses:

L. S. MAJOR, J. ls. 000x. 

